.NET十进制。求和与-1相乘 [英] .NET decimal.Negate vs multiplying by -1

问题描述

decimal.Negate（myDecimal）和 myDecimal * -1 之间是否有区别（也许可读性除外） ？

Are there any differences between decimal.Negate(myDecimal) and myDecimal * -1 (except maybe readability)?

推荐答案

我怀疑 Negate 存在，因为存在一元减号（ op_UnaryNegation ），并且最好的方法是使用代表相同功能的方法，这样不支持运算符重载的语言仍然可以达到相同的结果。

I suspect Negate exists because there's a unary minus operator (op_UnaryNegation), and it's good practice to have methods representing the equivalent functionality so that languages which don't support operator overloading can still achieve the same result.

因此，将它与 myDecimal * -1 进行比较可能会有助于将其视为编写 -myDecimal 。

So instead of comparing it with myDecimal * -1 it may be helpful to think of it as being an alternative way of writing -myDecimal.

（我相信它也已进行了优化-考虑到浮点的工作方式，取一个值比普通乘法要简单得多；有一点需要翻转。不需要来执行任何实际的算术。）

(I believe it's also optimised - given the way floating point works, negating a value is much simpler than normal multiplication; there's just a bit to flip. No need to perform any actual arithmetic.)

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